JP2001317450A - Liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always agitate liquid while continuously supplying the liquid, and to easily install an agitating mechanism without complicating a structure of a syringe. SOLUTION: A piston rod 25 for supporting a piston 42 is reciprocated to supply the liquid by a prescribed quantity to the outside of the syringe 26 from second and fourth ports 29 and 31 by alternately pressurizing both sides for sandwiching the piston 42 inside of the syringe 26. A pair of agitators 47 and 48 are rotatably arranged on both sides for sandwiching the piston 42 on the inside of the syringe 26. Magnets 55 and 56 for generating a magnetic field in the radial direction of the syringe 26 are built in the agitators 47 and 48. Agitator driving rings 49 and 50 having magnets 59 and 60 are rotatably arranged on the outer periphery of the syringe 26. The agitator driving rings 49 and 50 are rotated so that the agitators 47 and 48 are rotated from the outside of the syringe 26 by using magnetic force of the magnets 55, 56, 59 and 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply device for supplying a predetermined amount of liquid or other fluid material to the outside of a syringe by pressurizing the inside of a storage container (hereinafter referred to as "syringe"). .

[0002]

2. Description of the Related Art As is well known in Japanese Patent Application Laid-Open No. 10-309456, a piston is reciprocated inside a syringe,
A device for alternately supplying a liquid from both chambers of a syringe sandwiching a piston is known. Considering the continuous supply of a lubricant containing a solid as a liquid with this supply device, unless the lubricant is constantly stirred, the solid precipitates and the concentration cannot be kept constant. For this reason, a stirring mechanism was required in the syringe.

[0003] As the stirring mechanism, Japanese Patent Application Laid-Open No. 10-1465 is disclosed.
No. 53 discloses this. In this publication, a liquid adhesive is stored in a syringe having a discharge port on the bottom surface, and the adhesive is discharged from the discharge port by pressing the inside of the syringe with compressed air toward the discharge port. A device has been proposed. The syringe of this device is disposed with the discharge port facing down, and the upper side is open. A stirring means is provided in the syringe to keep the adhesive at a constant viscosity. The stirring means includes a stirring propeller and a drive shaft for holding the propeller. The drive shaft is arranged between the inside and the outside of the syringe through the opening side of the syringe, and rotates the stirring propeller inside the syringe when a drive from the outside is input.

[0004]

However, assuming that such a stirring mechanism is incorporated in the above-described supply device, how to treat the drive shaft of the stirring mechanism becomes a problem. This is because the drive shaft and the piston rod overlap. Therefore, considering that the drive shaft is passed through the syringe from another position, the structure of the gap seal between the drive shaft and the syringe is complicated, and there is a disadvantage that the cost is increased.

[0005] The present invention has been made in view of the above-described background, and it is possible to constantly agitate a liquid inside a syringe while continuously supplying the same, and to simplify the structure of the syringe without having to complicate the structure of the syringe. It is an object to provide a liquid supply device that can be attached at low cost.

[0006]

According to a first aspect of the present invention, there is provided a liquid supply device provided on both sides of a piston inside a syringe so as to be rotatable about an axis parallel to a moving direction of the piston. And a pair of stirrer rotating means disposed on the outer periphery of the syringe corresponding to these stirrers and rotating at least the stirrer on the suction end side by magnetic force. In addition, to the stirrer,
Permanent magnets may be embedded in rotationally symmetric positions so that the stirrer is rotated by the rotating magnetic field generated by the stirrer rotating means.

Further, a piston rod passing through the center of a syringe is integrally provided on both sides of the piston, and the stirrer is
It may be slidably and rotatably attached to the piston rod. Further, a piston feed means may be connected to one end of the piston rod, and the piston feed means may supply a fixed amount of liquid every time the piston is moved to one or the other with a small stroke.

Further, immediately after the switching of the movement direction of the piston, one end of the syringe serving as a new supply end may be opened upward to form a discharge path for bubbles. Further, during the formation of the discharge path, the piston rod may be moved by a predetermined stroke toward the supply end.

[0009]

FIG. 1 shows a lubricant application system 10 using a supply device of the present invention. The coating system 10 includes a collection tank 11, a four-way switching valve 12,
Two-way selector valves 13, 14, supply tank 15, supply device 1
6, a need valve 17, and the like. The supply operation of the supply device 16 applies a fixed amount of lubricant to the object 18 through the needle valve 17. As the lubricant, a lubricant having high volatility and containing a solid content is used.

The article 18 is transported along a transport line 20 while being placed on a pallet 19 in a fixed posture. The pallet 19 is positioned by positioning means in the coating process. After the positioning, the supply operation of the supply device 16 is performed after receiving the positioning completion signal.
The needle valve 17 is arranged in a posture in which the nozzle 17a faces the application portion of the object 18 to be coated. The applied object 18 is conveyed to the next step by the positioning means releasing the positioning in response to receiving the application completion signal. Then, in the coating process, a new coating object 18 is transported.

The needle valve 17 is provided with an open / close valve. The on-off valve opens and closes the nozzle 17a using compressed air supplied from the compressor 21.
The open / close valve is normally open. A cleaning mechanism 22 is arranged near the nozzle 17a. The cleaning mechanism 22 uses the compressed air supplied from the compressor 21 to blow off the lubricant attached to the nozzle 17a to perform cleaning.

The supply device 16 includes a rod driving actuator 24, a piston rod 25, and a syringe 26, and moves the amount of lubricant discharged from the needle valve 17 in the forward or backward movement direction of the piston rod 25. Determine by quantity.

The rod driving actuator 24 includes a driving means such as a pulse motor and a converting means for converting the driving into a reciprocating motion. These correspond to the piston feeding means of the present invention. The piston rod 25 moves a piston provided inside the syringe 26 in the forward or backward movement direction by driving the actuator 24. Syringe 26
Are provided with first to fourth ports 28 to 31 which are openings inserted from the outside to the inside. The first and second ports 28 and 29 are on one side of the inside of the syringe 26 with respect to the piston, and the third and fourth ports 3 and
0 and 31 are provided on the other side, respectively. These first and second ports 28 and 29, and third and fourth ports 3
The reference numerals 0 and 31 are provided to face the upper and lower portions of the inside of the syringe 26, respectively. The first and third ports 30 and 31 are connected to the pair of two-way switching valves 13 and 14 by Teflon (registered trademark) tubes.

The two-way switching valves 13 and 14 are connected to the recovery tank 11 by Teflon tubes, respectively, and are switched between the recovery position and the closed position by driving the two-way switching actuators 33 and 34. At the collection position, the first and third ports 28 and 30 are connected to the collection tank 11, respectively. In the closed position, the first and third ports 28, 30 are closed. The collection tank 11 is a sealed tank with a pressure regulating valve, and collects bubbles discharged from the inside of the syringe 26 together with the lubricant during an air bleeding operation inside the syringe 26.

The second and fourth ports 29 and 31 are connected to the four-way switching valve 12 by Teflon tubes. The supply tank 15 and the needle valve 17 are connected to the four-way switching valve 12 by a Teflon tube in addition to the second and fourth ports 29 and 31, respectively. The four-way switching valve 12 is switched between a forward movement position and a backward movement position. In the forward movement position, the fourth port 31 is connected to the supply tank 15 when the piston rod 25 is moved forward.
Further, the second ports 29 are connected to the needle valves 17 respectively. In the return position, the second port 29 is connected to the supply tank 15 and the fourth port
Connect port 31 to needle valve 17. This switching is performed by driving the actuator 35 for four-way switching.

The supply tank 15 is a closed tank with a pressure regulating valve and contains a lubricant. Inside the tank 15, a supply tank stirring mechanism 38 is provided. The supply tank stirring mechanism 38 uses a stirring mechanism having a magnet stirrer structure, and stirs the lubricant inside the supply tank 15 in order to keep the concentration uniform. In addition,
The above-described mechanisms, actuators, and the like are collectively controlled by the control unit 40. The tube is not limited to a Teflon tube, and the material of the tube such as a resin tube or a metal tube may be appropriately selected according to the properties of the lubricant. Also, supply tank 1
5 is arranged at a position higher than the collection tank 11.

As shown in FIG. 2 and FIG. 3, the inside of the syringe 26 has a circular cross section with a symmetrical shape, and is held horizontally lying down. A piston 42 is built in the syringe 26. Piston 42
Is fixed to the piston rod 25. The piston rods 25 are provided on both sides of the piston 42. Inside the syringe 26, at least the reciprocating range L of the piston rod 25 is substantially the same as the diameter of the piston 42. An O-ring 43 is attached to the center of the piston 42 so as to tightly close the gap between the outer diameter of the piston 42 and the opening diameter inside the syringe 26. Large diameter portions 44 and 45 are formed on the supply and suction sides of the inside of the syringe 26 which change according to the moving direction of the piston 42. The large diameter portions 44 and 45 are formed shorter than the reciprocating range L of the piston rod 25 and larger than the outer diameter of the piston 42. First and third ports 28 and 30 are formed at the top of these large diameter portions 44 and 45, and second and fourth ports 29 and 31 are formed at the bottom.

The supply device 16 is provided with a stirring mechanism for stirring the inside of the syringe 26. This stirring mechanism
This is for keeping the component ratio of the lubricant inside the syringe 26 constant, and includes a pair of stirrers 47 and 48, a pair of stirrer driving rings 49 and 50, and a pair of stirring actuators 51 and 52. It is configured. A pair of stirrers 4
7, 48 have stirring blades 53, 54 and magnets 55, 56 provided inside, and are disposed between the piston 42 and the large diameter portions 44, 45 respectively with the piston rod 25 inserted. ing. These stirrers 47, 4
8 is rotatable with respect to the piston rod 25 and is also movable in the axial direction of the piston rod 25. The reciprocation of the piston rod 25 is caused by the pair of stirrers 4
7, 48. The stirrers 47, 48
Has an outer size that does not hit the inner wall of the syringe 26 so that the inner volume of the syringe 26 does not change due to the inside of the syringe 26 being worn by rotation.

The pair of stirrer drive rings 49 and 50 have a substantially donut-shaped cross section, and are arranged at positions corresponding to the outer peripheries of the stirrers 47 and 48 and so as to surround the outside of the thin strip 26. . These stirrer drive rings 49 and 50 are rotatably mounted on the syringe holding member 58 via bearings, and are mounted on gears 62 and 63 formed on the outer periphery thereof.
When the drive of the first and the second drive 52 is transmitted, they rotate.
Stirrer drive rings 49 and 50 have magnets 59 and 6 inside.
0 is attached. Stirrer drive rings 49, 50
Are magnets 59, 60 and magnets 55, 5 of stirrers 47, 48.
The pair of stirrers 47 and 48 are held at that position by the magnetic force acting on the stirrer 6, and are rotated following their own rotation.

As shown in FIG. 4, holes 62 through which the piston rod 25 is inserted are formed in the stirrers 47 and 48 on both side surfaces facing the moving direction of the piston rod 25, respectively. The stirring blades 53 and 54 are provided on one of the two side surfaces and at three positions in the circumferential direction around the piston rod 25 so as to protrude in parallel with the piston rod 25. The stirrers 47 and 48 have the same shape as each other, and the protruding directions of the stirring blades 53 and 54 are opposite to each other.
In addition, the stirring blades 54 are arranged in a posture facing the large-diameter portion 45. The stirring blades 53 and 54 may be inclined so as to generate a vortex in the axial direction of the piston rod 25. Further, the stirring blades 53 and 54 may be attached along a direction intersecting the axis of the piston rod 25.

The stirrer 48 has a hole 6 as shown in FIG.
A total of six magnets 56 are provided at three divided positions in the circumferential direction around the center 3 and two rows in the moving direction of the piston rod 25. In the stirrer 48, each magnet 56 is incorporated into three bottomed holes 64 formed along three divided positions in the circumferential direction around the movement direction of the piston rod. The other stirrer 47 has the same number, position, and mounting method of the magnets 55 as the stirrer 48. In addition,
The mounting positions of the magnets 55 and 56 may be any positions as long as they are rotationally symmetric about the rotation axes of the stirrers 47 and 48.

As shown in FIG. 6, magnets 59 and 60 are respectively provided on the stirrer drive rings 49 and 50 at three divided positions in the circumferential direction with the movement direction of the piston rod 25 as an axis.
And two rows in the direction of movement of the piston rod 25, for a total of six pieces. The magnets 56 and 60 of the stirrer 48 and the stirrer drive ring 50 have the same magnet polarity so that the magnets attract each other. Thereby, the stirrer 48
While the stirrer drive ring 50 is stopped, the rotation is maintained at that position, and the stirrer drive ring 50 rotates following the rotation thereof. The magnets of the other stirrer 47 and the stirrer drive ring 49 also have a magnetic relationship to attract each other. Note that the magnet polarities may be aligned so that the magnetic forces repel each other.

Next, the operation of the above configuration will be briefly described. As shown in FIG. 1, the lubricant application system 10
0 automatically operates according to the sequence stored in the memory 70. The sequence has two modes, a normal mode and a standby mode, as shown in FIG. These modes are appropriately switched according to the traffic of the pallet 19 flowing through the transport line 20.

The normal mode is executed when the pallets 19 are continuously conveyed without stagnation, and the standby mode is executed when the pallets 19 are not clogged up and downstream of the conveying line 20 and when the pallets 19 are upstream. This is executed when there are no 19 transports. The modes are sensors 71, which are arranged on the upstream and downstream sides of the transport line 20 with the coating process interposed therebetween.
Switching is performed automatically by detecting the presence or absence of the pallet 19 at 72 (see FIG. 1).

In the normal mode, first, the needle valve 1
The supply operation is performed with the open / close valve 17b (see FIG. 10) of No. 7 open. In the supply operation, as shown in FIG. 8, first, it is confirmed whether or not the two-way switching valves 33, 34 are in the closed position. Although not shown, the piston rod 2
It is also confirmed that the four-way switching valve 12 has been switched to the forward or backward movement position corresponding to the direction in which 5 is moved. Then, after receiving the positioning completion signal, the actuator 24
Is driven to move the piston rod 25 by one fixed stroke in one of the forward and backward movement directions. The amount of the lubricant corresponding to the constant stroke movement is discharged from the needle valve 17, and a fixed amount of the lubricant is applied to the object 18. At this time, the stirrers 47 and 48 on the suction side of the inside of the syringe 26 are rotated. Then, the stirrers 47 and 48 corresponding to the suction side are constantly rotated. The stirrers 47 and 48 are moved in the direction of movement of the piston rod 25 by the movement of the piston rod 25, but are returned to their original positions by the magnetic force of the magnets 56 and 60.

As described above, in the normal mode, each time the positioning completion signal is received, the actuator 24 is driven to move the piston rod 25 little by little by a predetermined stroke, and a fixed amount of lubricant is sequentially applied to the object 18 to be coated. Apply to. Then, when the piston rod 25 reaches the end in the movement direction at that time, the control unit 40 controls the actuator 24 to move the piston rod 25 in a direction opposite to the previous movement direction. At the time of the return in the moving direction, a syringe return operation is performed. When the piston rod 25 is turned back, the supply side of the inside of the cylinder 25 naturally changes to the suction side. Therefore, the rotation of the stirring elements 47 and 48 which have been rotating until now is stopped, and the suction side changed to the newly changed suction side. Certain stirrers 47 and 48 are rotated.

As shown in FIG. 9, the returning operation of the syringe includes a liquid dripping preventing operation, an air bleeding operation, a switching operation of the four-way switching valve 12, a dumping operation, and a nozzle cleaning operation.

FIG. 10 shows a state where the piston rod 42 has reached the end in the forward movement direction. In this state, the two-way switching valves 33 and 34 are in the closed position, and the four-way switching valve 12 connects the fourth port 31 to the supply tank 15.
And the second port 29 is connected to the needle valve 17 at the forward movement position.

The liquid dripping prevention operation is performed as shown in FIG.
By driving the actuator 24, the piston rod 25 is slightly moved in the direction opposite to the previous movement direction, that is, in the backward movement direction. As a result, the lubricant is sucked into the syringe 26 from the port serving as the supply port during the previous supply operation, that is, the second port 29. Thereby, it is possible to prevent the liquid from dripping out of the nozzle 17a connected to the second port 29 little by little.

After the liquid dripping prevention operation, an air bleeding operation is performed. In the air bleeding operation, as shown in FIG. 12, the two-way switching valve 33 connected to the suction side of the inside of the syringe 26 during the previous supply operation is switched to the open position for a fixed time. Then, while the two-way switching valve 33 is in the open position, the piston rod 25 is moved by a predetermined stroke in the direction opposite to the previous supply operation, that is, in the backward movement direction. By switching the two-way switching valve 33 to the open position, bubbles generated by negative pressure inside the syringe 26 flow together with the lubricant toward the collection tank 11 and are removed from the inside of the syringe 26. At this time, since the supply tank 15 is arranged at a position higher than the recovery tank 11, the lubricant inside the syringe 26 can be easily replaced by the difference in height. Moreover,
The movement of the piston rod 25 by a predetermined stroke facilitates the removal of air bubbles together with the lubricant into the collection tank 11. The predetermined stroke movement of the piston rod 25 at this time is set to be smaller than the constant stroke movement during the supply operation. The predetermined stroke movement of the piston rod 25 performed during the air bleeding operation may be the same as the constant stroke movement during the supply operation, or may be increased.

The first and third ports 28, 30 are provided at the tops of the large-diameter portions 44, 45, at which bubbles flowing into or generated inside the syringe 26 are collected. Therefore, the bubbles can be quickly and reliably released. Therefore, the bubbles do not grow inside the syringe 26 even by the subsequent supply operation, so that the supply operation can be continued. Note that the operation of moving the piston rod 25 may be omitted, and the two-way switching valve 33 may be simply switched to the open position during the air release operation.

After the air bleeding operation, the actuator 35 is driven to drive the four-way switching valve 12 as shown in FIG.
Is switched to the return position on the opposite side of the previous supply operation.
By this switching, the second port, which was the suction port during the previous supply operation,
Port 29 changes to a supply port.

After the switching operation of the four-way switching valve 12,
Perform a discard operation. This discarding operation drives the actuator 24 to slightly move the piston 42 in the backward direction. As a result, the air bubbles generated by switching the four-way switching valve 12 are discharged into the syringe 26, and at the same time, the lubricant is supplied to the needle valve 17 into which the air has entered by the previous liquid dripping preventing operation to expel the air. At this time, the control unit 40 drives the insertion / removal mechanism 70 arranged in the application step to insert the scattering prevention plate 71 on the front surface of the nozzle 17a, thereby preventing the lubricant discharged from the nozzle 17a from scattering. Thereafter, the cleaning mechanism 22 is operated to remove the lubricant adhering to the nozzle 17a. Thereafter, the piston rod 25 is gradually moved in the backward direction by a predetermined amount to supply a fixed amount of lubricant. As described above, since the direction of the piston rod 25 moved at the time of the folding operation and the direction of moving the piston rod 25 at the time of the subsequent supply operation are the same, the supply operation can be performed quickly. Then, when the piston rod 25 reaches the end in the backward movement direction, the syringe turning operation is performed so as to have the same operation as described above.

By continuing the normal mode, the above-described operation is repeated, and the lubricant is sequentially applied to the object 18 through the needle valve 17.

Next, the standby mode will be described. In the standby mode, the sensors 71 and 72 are constantly monitored, and the mode can be returned to the normal mode at any time.

As shown in FIG. 14, in the stand-by mode, both stirrers 47, 48 are rotated for a predetermined time to stir every predetermined time after switching to the stand-by mode. Note that, even in the standby mode, the stirrer 47 or 48 on the suction side at that time inside the syringe 26 is still rotating. Therefore, here, the actuator 51 or 52 is controlled so that the other stirrer 47 or 48 is rotated. This stirring is performed every elapse of a predetermined time. Thereby, the concentration of the lubricant inside the syringe 26 can be always kept uniform.

Further, if the standby mode is continued for a long time while continuing the cycle of the stirring operation, the piston rod 26 is moved so that the supply side at that time becomes suction, and the liquid dripping prevention operation described in FIG. After that, the opening / closing valve 17a of the needle valve 17 is closed. Thereby, the evaporation of the lubricant can be prevented.

When returning from the standby mode in which the open / close valve 17b is closed to the normal mode, a return operation is performed as shown in FIG. In this operation, after the opening / closing valve 17b of the needle valve 17 is opened, the piston rod 25 is fed a plurality of predetermined times to supply the lubricant to the needle valve 17 to release the air that has entered the needle valve 17. This supply operation is set to the number of times that the lubricant is reliably discharged from the nozzle 17a. During this time, the insertion / removal mechanism 70 is operated, and the scattering prevention plate 71 is inserted into the front surface of the nozzle 17a. Thereafter, after the scattering prevention plate 71 comes off from the front surface of the nozzle 17a, the nozzle cleaning is performed, and then the piston rod 25 is moved little by little to supply the lubricant at a constant rate.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The material of the syringe 26 is preferably formed of a non-magnetic material such as resin, ceramic, and glass. As the resin, transparent PFA (perfluoroalkoxy fluororesin) is desirable. The stirrer 47,
As the material of the material 48, a resin, a ceramic, or the like is preferable. Further, as a material of the stirring drive rings 49 and 50, a non-magnetic material such as resin or brass is desirable.

The object 18 to be coated in this embodiment is a reuse part built in a film unit with a lens. The lens-fitted photo film unit includes a main body in which a photo film is incorporated and an exposure mechanism is mounted, and front and rear covers that cover the main body from front and rear. The exposure mechanism of the main body unit includes a photographing lens, a shutter mechanism, a film unwinding mechanism, and the like. The used lens-equipped film unit is collected, disassembled, taken out, and reused. The shutter mechanism is of a well-known kicking type and includes a shutter drive lever, shutter blades, a charge spring, and a pullback spring. The shutter drive lever is rotatable about a vertical axis between a shutter charge position and a kicking completion position.
One end of the charge spring is hung on a spring receiving portion of the shutter drive lever, and the other end is hung on a member different from the shutter drive lever, and urges the shutter drive lever toward the kicking completion position. The shutter blade swings across the photographing optical axis by being kicked off by the tip of the shutter drive lever during rotation from the charge position to the kicking completion position, and opens and closes the shutter opening. The retraction spring pulls the shutter blade back to a position that closes the shutter opening.

The film unit with the lens is collected at the factory after use, and is recycled here. Recycling includes recycling, which uses parts as raw materials for each material, and reuse, which uses parts as they are for new industrial parts. As for the film unit, the main unit is reused because it is covered with an outer cover and is not so dirty or damaged. When the main body is reused, if the opening / closing speed of the shutter blades is inspected according to the frequency of use and the mode of use, the speed is uneven. Therefore, it has been found that the dispersion can be suppressed within a predetermined range by applying the lubricant without replacing the parts. The lubricant is applied to the catch between the spring receiving portion of the shutter drive lever and one end of the charge spring by using the above-described automatic application system. After the application, the shutter opening / closing speed is measured a plurality of times to check the variation in the shutter opening / closing speed, and the effect of the application is checked by checking whether the variation is within a predetermined variation.

As the lubricant, a liquid lubricant obtained by combining an oil component having good low-temperature fluidity and an ultrafine particle fluororesin, for example, Drysurf HF-1800 (trade name) provided by Harves Co. (company name) Is preferred. This lubricant is called a dry film lubricant, has a milky white opaque appearance, has no flash point (open type), has an operating temperature range of -30 to 120 ° C, and has a specific gravity of 1.53.
(25 degrees), the surface after application is half wet, the ozone depletion potential is 0, the atmospheric life is 4.1 years,
In addition, GWP (CO ² = 1) has a property of 500. As described above, the lubricant has a high volatility and contains a solid content. Therefore, when the lubricant is stored in a closed container, the concentration changes. To keep these, the automatic coating system 10 described above is employed.

The amount of the lubricant applied to the main body is as follows.
0.001 to 0.01 cc. Since the automatic coating system 10 described above is of a type in which the piston rod 25 is folded back in the reciprocating direction, continuous operation is possible. And since it is a lubricant containing a solid content, stirring is performed on the suction side even during supply. Since the volatility of the lubricant is high, the opening and closing valve 17b of the needle valve 17 is closed during a long standby time. In the present invention, any liquid may be used without limitation to the lubricant having the above-described properties.

In the above embodiment, the stirrers 47 and 48 rotate inside the syringe 26 while being guided by the piston rod 25. However, the present invention is not limited to this, and as shown in FIG. A concave portion 84 is formed inside the syringe 82, and the stirrer 8 is guided by the concave portion 84.
3 may be rotated. The recess 84 includes an inner peripheral surface of the syringe 26 and a sleeve 88 inserted from one of the syringes 26. As the stirring blade 86, a stirrer 83 may be formed in a donut shape in cross section, and a plurality of stirrers 83 may be provided on the inner periphery at a predetermined pitch so as not to hit the piston rod 87. As these stirring blades 86, it is preferable that the blades are inclined such that the liquid convections toward the axial direction of the piston rod 87 by the rotation of the stirring element 83.

In the above embodiment, the stirrer driving rings 49 and 50 for rotating the stirrers 47 and 48 together with themselves using magnetic force are used as the stirrer rotating means of the present invention. The present invention is not limited to this, and may be configured by a magnetic coil 80 and a control circuit 81 as shown in FIG. The magnetic coil 80 is configured by a plurality of coils that generate a rotating magnetic field along the outer circumference of the syringe 82 at three or four divided positions on the outer circumference of the syringe 82. Stirrer 83
Is provided with a concave portion 84 on the inner peripheral surface of the syringe 82, and is guided rotatably inside the concave portion 84. Magnets 85 that generate a magnetic field in the radial direction are attached to the stirrer 83 at at least two positions facing each other in the circumferential direction. The control circuit 81 generates a current for exciting the magnetic coil 80 with a phase for rotating the stirrer 83.

[0046]

As described above in detail, in the liquid supply apparatus of the present invention, a pair of stirrers provided rotatably about both axes parallel to the moving direction of the piston on both sides of the piston inside the syringe. And a pair of stirrer rotating means arranged on the outer periphery of the syringe corresponding to these stirrers and rotating at least the stirrer on the suction end side by magnetic force, so that the stirring drive shaft is inserted into the syringe. There is no need, and therefore, the agitation mechanism can be easily attached, and the internal structure of the syringe does not need to be complicated, so that the cost can be reduced. In addition, the liquid can be continuously supplied, and the suction side is also stirred during the supply, so that the concentration of the liquid in the syringe can be reliably kept constant.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an automatic coating system.

FIG. 2 is a sectional view of a main part showing a supply device.

FIG. 3 is a perspective view showing a cross section of the syringe.

FIG. 4 is a perspective view showing the appearance of a stirrer.

FIG. 5 is a perspective view showing a cross section of the stirrer.

FIG. 6 is a sectional view schematically showing a relationship between a stirrer and a stirrer drive ring.

FIG. 7 is a flowchart showing the operation of the automatic coating system.

FIG. 8 is a flowchart showing a normal mode.

FIG. 9 is a flowchart showing a syringe return operation.

FIG. 10 is an explanatory view showing an outline of the automatic application system, and shows a state after the piston rod is moved back.

FIG. 11 is an explanatory view schematically showing the automatic coating system, showing a state after a liquid dripping preventing operation is performed.

FIG. 12 is an explanatory view schematically showing the automatic coating system, and shows a state where an air bleeding operation is performed.

FIG. 13 is an explanatory diagram schematically showing the automatic coating system, showing a switching operation of a four-way switching valve and a throwing-out operation performed thereafter.

FIG. 14 is a flowchart showing a standby operation.

FIG. 15 is a flowchart showing a return operation.

FIG. 16 is a sectional view showing another embodiment of the supply device.

[Explanation of symbols]

 12 Four-way switching valve 13,14 Two-way switching valve 16 Supply device 17 Needle valve 25,87 Piston rod 26,82 Syringe 42 Piston 47,48 Stirrer 49,50 Stirrer drive ring 53,54,86 Stirrer blade 55, 56, 60, 85 Magnet 80 Magnetic coil

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 3E083 AA20 3H075 AA04 AA12 BB03 BB16 BB17 CC30 CC35 CC36 CC40 DA03 DA04 DA07 DA09 DA20 DA25 DA30 DB03 DB08 DB49 DB50 EE01 EE14 EE16 4F041 AA05 AB01 BA05 BA31 BA43 A064C04 AC26

Claims (6)

[Claims] A liquid is supplied by moving a piston inside a syringe, supplying liquid from one end of the syringe and sucking liquid from the other end according to the amount of movement of the piston, and switching the moving direction of the piston. In a liquid supply device that can be switched between an end and a suction end, a pair of stirrers provided rotatably around an axis parallel to the movement direction of the piston on both sides of the piston inside the syringe, and corresponding to these stirrers. And placed on the outer circumference of the syringe,
A liquid supply device comprising: a pair of stirrer rotating means for rotating at least the stirrer on the suction end side by magnetic force. 2. The liquid according to claim 1, wherein a permanent magnet is embedded in the stirrer at a position that is rotationally symmetric, and the stirrer is rotated by a rotating magnetic field generated by stirrer rotating means. Feeding device. 3. A piston rod passing through the center of a syringe is integrally provided on both sides of said piston, and said stirrer is slidably and rotatably attached to said piston rod. 3. The liquid supply device according to 2. 4. A piston feed means is connected to one end of said piston rod, and a constant amount of liquid is supplied each time said piston feed means moves said piston together with said piston rod in a small stroke. The liquid supply device according to claim 3, wherein 5. A discharge path for bubbles is formed by opening one end of a syringe which is a new supply end upward immediately after switching of the movement direction of the piston.
The liquid supply device according to claim 1. 6. The liquid supply device according to claim 5, wherein the piston rod is moved toward the supply end by a predetermined stroke during the formation of the discharge path.